#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>

int main()
{
	char s[20];
	int i;
	printf("Please input string:\n");
	gets(s);
	for (i = 0;s[i]!='\0'; i++)
		if (s[i] >= 'A' && s[i] <= 'Z')
			s[i] = s[i] + 'a' - 'A';
	puts(s);
	return 0;

}